Lei (Eddy) Xu created HDFS-12483:
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Summary: Provide a configuration to adjust the weight of EC
recovery tasks to adjust the speed of recovery
Key: HDFS-12483
URL: https://issues.apache.org/jira/browse/HDFS-12483
Project: Hadoop HDFS
Issue Type: Improvement
Components: erasure-coding
Affects Versions: 3.0.0-alpha4
Reporter: Lei (Eddy) Xu
Assignee: Lei (Eddy) Xu
Priority: Minor
The relative speed of EC recovery comparing to 3x replica recovery is a
function of (EC codec, number of sources, NIC speed, and CPU speed, and etc).
Currently the EC recovery has a fixed {{xmitsInProgress}} of {{max(# of
sources, # of targets)}} comparing to {{1}} for 3x replica recovery, and NN
uses {{xmitsInProgress}} to decide how much recovery tasks to schedule to the
DataNode this we can add a coefficient for user to tune the weight of EC
recovery tasks.
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